Circuit breaker control system



Dec. 11, 1945. w. A."DERR 2,390,782

' CIRCUIT BREAKER CONTROL SYSTEM Filed March 31, 1942. s Sheets-Sheet 1 .Ba/fery fl/hv/hafor' wmqsssss: INVENTOR M'l/ardfi? Der/7 v ATTORNEY 1, 1945- w. A. um 2,390,782

CIRCUIT I BREAKER CONTROL SYSTEM Filed March 31, 1942 3 Sheets-Sheet 2 WITNESSES:

INVENTOR 3345. w QERR v 2,3G,782

CIRCUIT BREAKER CONTROL SYSTEM Filed March 31, 1942 3 Sheets-Sheet 3 WITNESSES: S INVENTOR Patented Dec. 11, 1945 CIRCUIT BREAKER CONTROL SYSTEM Willard A. Derr, Wilkinsburg, Pa., assignor to Westinghouse Electric Corporation, East Pittsburgh, Pa., a corporation of Pennsylvania Application March 31, 1942, Serial No. 437,005

17 Claims.

The present invention relates, generally, to circuit breaker control systems, and, more particularly, to control systems for a plurality of automatic reclosing circuit breakers.

In the operation of power distribution systems, it is common practice to transmit power to and from stations of the power system over a plurality of circuits which are connected to a common bus at the stations. The several circuits which ar connected to a common bus at a station are often connected to different stations and it is often necessary, in order to insure the greatest continuity of service, that certain of the circuits be given preference in supplying power to the station in the event that there is an interruption of power flow or any system disturbance that is likely to cause an interruption of power flowi An object of the invention is to provide a control system for a plurality of automatic reclosing circuit breakers at a power station which shall function in response to the operation of the breakers and the potentials on the several circuits controlled ,by the breakers to selectively reclose the breakers and synchronize the potentials on the circuits before closing the breakers in a predetermined order of preference.

Another object of the invention is to provide a plurality of automatic reclosing circuit breakers with a control system which shall function to selectively reclose the breakers a desired num-- ber of times depending upon the potential conditions on the two sides of the breakers and'to selectively close the breakers after synchronizing the systems connected to the two sides of the breakers in a predetermined order.

Another object of the invention is to provide an automatic recloslng circuit breaker control system which shall function to close a breaker in response to potentials on the circuits connected to the breaker when synchronism between the potentials is reached and to prevent reclosure of the breaker in response to synchronism in the event that the breaker opens within a predetermined time after such closure in response to synchronism.

A further object of the invention is to provide a control system for a plurality of circuit breakers, which shall function to automatically control the breakers as desired and to manually control the breakers as desired subject to the operation of the automatic control means.

These and other objects of the invention will be apparent from the following detailed description taken in connection with the accompanying drawings in which the three sheets comprising Fig. 1-A, 1-3 and 1-C-when joined together as indicated constitute a single figure, which is a diagrammatic representation of a control system for a plurality of circuit breakers embodying the principal features of the invention. Similar elesive relays FF, FZ and FR, respectively, supervisory control relays FST, ZST and RST, respectively, and manually operable circuit control de-' vices FCST, ZCS'I and RCST, respectively. A fault responsive relay EFZR is disposed to energizetrip devices F1, 2'1 and RT upon the occurrence of a fault on the bus FZR.

The breakers FCB, ZCB and RCB are provided with closing devicesFC, Z0 and RC, respectively, the energizations of which are controlled by reclosing devices F3, Z3 and R3, a synchronism responsive device AS, supervisory control relays FSC, ZSC and RSC, and manually operable control devices FCSC, ZCSC and RCSC. The closing devices FC and ZC are also controlled by reclosing devices FI and 21, respectively.

For the purpose of simplification the energizing circuits for the fault relays FF, FZ, FR and EFZR have not been illustrated in the drawings, it being understood that these relays may be energized by any well known means when a fault occurs on the circuits with which they are associated. Similarly, the supervisory control system for actuating the relays FSC, FST, ZSC, ZST, R and RST have not been shown, it being understood that these supervisory control relays may be selectively energized as desired by any well known supervisory control system.

Transfer switches CF, CZ and CR are actuated by a cam operator as shown by the operating members A and L to selectively prepare the control systems of the individual circuit breakers for automatic operation and local manual operation,

respectively. These transfer switches are shown in the drawings in the automatic position.

Direct current control power may be supplied by any well known source of direct current power and. c nnections to sllch a source are indicated g in the'drawings by positive and negative signs.- Potential transformers FP, ZP, RP and BP are connected to be energized by the potentials of the circuits FL, ZL and BL and the bus FZR respectively and supply energizing potentials for various parts of the'control system as will be explained in detail hereinafter. The terminals of these transformers are indicated by the reference characters Fa, Fb, Za, Zb, Ra, Rb, Ba and Bb and connections to these terminals are indicatedby the identical reference characters to thereby simplify the drawings by obviating the necessity of showing a conductor on the drawings for each of these connections.

The elements-of the control system,'their construction, functioning and cooperative relationships may best be understood by the following nated by numbers attached to the apparatus refs complete description of the operation of the syserence characters. Thus, for example, the contact elements of the relay F2! are FX- -I, FX2

and FX-I. For further simplification, the circults have been so illustrated as to require no reference to the individual conductors of the circuits and are referred to'by listing the apparatus elements and contact elements in the circuits. Thus. for example, the holding circuit for the relay FX extends from positive potential through FY-l, Fx' and Fx -3 to negative potential. and the en ergizing circuit for the relay BFZ extends from Ba through BFY-4 and BFZ to Bb.

Operation on line fault Assume the circuit breakers F013, 2013 and R03 to be in their normal closed position. the transfer switches CF, CZ and CR in the "automatic" position. and the other elements of the system in the position; shown in the drawings If a fault should occur on the power line circuit FL the fault relay FF will be energized to in turn energize the relay FFZ in a circuit extending from positive potential through FCB-l, FFZ and FF--I to negative potential. The relays FF and FFZ will energize the trip device PI of the circuit breaker FCB in a circuit extending from positive potential through FCB8. FOB-9 F1, FFZ-l and FF-l to negative potential. The relays FF and FFZ will also energize a delayed-release relay BFV in 'a circuit extending from positive potential through PCB-8, BFV, BFZ-l, PST-3.

BFW-l which is in parallel circuit relation with the contact element BFV-I. n

The opening of the breaker FCB will energize a motor FM of an automatic recloser device F3 in a circuit from Ba through FM, F3-l, FCB-i, AFX-l, FSC-l, FST-l, BFX--I and CFI to Bb. The recloser device F3 comprises a drum driven by the motor FM upon which there are disposed contact elements F3l, F3-2, F3--3a,

F3-3b andlF3--3c, which cooperate with sta-.

tionary contact elements as illustrated. The drum 20 also actuates a series of cams 4a, 4b and do which are disposed to actuate a latch member 22 against the bias of a spring member 24. The latch member 22 is disposed to be actuated to the left by the spring member 24 when a relay YF is actuated, and to thus limit the release of the relay YF when the relay YF is deenergized by the engagement of the, latch member 26 with the latch member 22. p

The relay YF has a contact element YF-l which is disposed to engage'its cooperating coni tact elements after the contact element YF5 is opened and before the contact element YF-S has closed when the relay YF is energized and held in closed position by a spring member 28. When the relay YF is released, the latch mem ber 26 will engage the latch member 22 and stop .the release movement of the relay YF in a position with the contact elements YF5 and YF- -t open and the contact element YF-.l closed,

cam members do, lb and 4c are disposed tore,-

FCST-2, mgr-4 and FF-l to negative poten F08 and the actuation of ,the relay BFV will ene'rglzea relay BFW in a circuit extending from positive potential through FCBI0, BFW,

BFV- and-CF2 to negative potential, and this circuit will be maintained until the end of the delayed-release interval of the delayed re lease relay BFV after the opening of the breaker FCB opens the energizing circuit of the relay BFV at PCB-l. The relay BFW will close its own holding circuit; through its contact ele ent lease the latch members 22 and 26 to permit, further release of the relay YF to the position shown in the drawings.

The deenergization of the power will deenergize a relay DF which is" connected to the potential transformer-FF. .The opening of I the breaker FCB and the release of the relay DF will energize a relay XF in-a circuit extending from positive potential through FCB6, XF,

YF5,-F3-3a, DF-l, DBX-i, AFX-2 and CF2 to negative potential. The relay XF will close its own holding circu t from positive potential through FCB 8. XF, XF--8, DF'-i, DEX-J, AFX2 and CF2 to negative poten tial.

' The relay XF will energize the relay YF from positive through FCB-B, XF-9, YF, DF-'i, DBXI, AFX-2 and CF2 to negative. The relay YF will energize a relay FX from positive potential through FY-l, FX, YF-6, XF-8,

DF-l, DEX-4, AFX-2 and CF2 to-negative potential. The relay YF will close another circuit for the recloser motor FM from Ba through FM, YF-l, AFX-I, FSC-l, FST-I, BFXI and CF-l to Bb. I

The relay FX will close its own holding circuit from positive potential through FY-l, FX and FX3 to negative potential. The relay FX will also close an energizing circuit for the closing coil FC of the circuit breaker FCB from positive potential through FX-i, FC and F X-2 tonegative potential. The closure of the circuit breaker FCB will energize the relay FY from positive potential through FCB1, FY and.FX3 to negative potential, and will reenergize DF byreenergizing the potential transformer FP. The-relay FY will close its own holding circuit from positive potential through FY-2, FY and FX3 to negative potential. The relay FY will open the I holding circuit of therelay FX at FY-l, and

the release of the relay =FX will release the relay j FY by opening the contact element FX3 1 The relay; X! and YF will be deenergized by circuit opening of the contact elements FCB-4 and DI -I. The relay YF will be latched, as described hereinbeiore, with contact elements .YF-i and YF-O open and YF-J closed, and

the recloser motor FM will remain energized through the contact element YF-l. It the cirthe contactelement F33a.

After a time interval required for the recloser motor FM to move the cam la into tripping relation with the latch device 22, the latch 22 will be tripped to fully release the relay YF and the circuit breaker will be reclosed again when the contact element F3--3b is closed by the operation oi. the relays XF, KY and FX, as described hereinbefore, with the contact element F3 3b substituted for the contact element F3-3a.

In the event that the circuit breaker FCB is reopened after each reclosure within the interval determined by the movement of the drum 2!] from F3--3a closed to F3-3b closed, the breaker will b reclosed again until in this instance, three reclosures have been made. If the breaker trips after the third reclosure, the motor F will drive the drum to lockout position with the contact element F3I open. It will be seen that with the circuit breaker FCB open and the relay YF released, the circuit of the motor FM will be broken-and the motor will stop when the contact element F3I is opened. In the event that the circuit breaker FCB remains closed after any reclosure, the energizing circuit for th motor FM will be maintained through the contact elements F3-2 and FCB-2 until the drum returns to the position shown in the drawings with the contact element F3-2 open. The recloser F3 will then be reset for the next sequence of three timed reclosures as described hereinabove.

.In the event that either of the circuit breakers ZCB or RG3 should be opened by their respective fault-responsive relays FZ and FR, their auto-.

paratus will make three attempts to reclose the breakers in a manner similar to that set forth in the description of the reclosure of the circuit breaker FCB by its recloser F3.

Operation on bus fault Upon the occurrence oi a fault on the bus FZR,

the relay EF'LR will be actuated to energize a.

relay EX from positive potential through EX and EFZR-J to negative potential. The relay EX tial through RCB-6, RCB5, RT and Ex--l to negative potential. The relay EX will close its own holding circuit from positive potential through EX, the contact elements FCB- -ll, ZCBII and RCB8 in parallel circuit relation and contact element EX4 to negative potential and this holding circuit will be closed until it is opened by the opening of all three of the circuit breakers.

The relay EX will also energize the relay BFV from pomtive potential through FCB8, BFV, Bl'Z-l PST-3, POST-2 and 123-4 to negative matic reclosures Z8 and R3 and associated appotential. When the breaker NB opens and before the delayed-release relay BFV is released. the relay BFW will be energized from positive potential through FCB-ll, BFW, BFV-I, and CF-2 to negative potential. The relay BFW will close its own holding circuit by means of its contact element BFW-I which is in parallel circuit relation with the contact element BFV-I. In a similar manner, the contact element EX-I will energize the relay BZV which, in turn, together with the opening of the circuit breaker ZCB, will energize the relay BZW, and the relay BZW will, in turn, close its own holding circuit through its contact element BZW-I. Similarly, EX-I will energize the relay BRV which, in turn, together with the opening 'of the circuit breaker ROB, will energize the relay BRW, and the relay BRW will, i

in turn, close its own holding circuit through its contact element BRW-I.

The deenergization of the bus FZR by the openin of the circuit breakers FCB, ZCB and RCB will deenergize the relay DBX, since the relay DBX is energized from the terminals Ba and 13b of the bus potential transformer BP.

In the event that the circuits FL, ZL and RL remain energized when their associated circuit breakers FCB, ZCB and RCB trip, or in the event that they are deenergized and then reenergized, the'system will make one attempt to reenergize the bus FZR by closing the circuit breaker FCB. The relay FX willbe energized from positive D0- tential through FY-I, FX; FCB-3, FI--I in the left-hand position, DBX2, DF-2, AFX-2, and CF-2 to negative-potential. It will :be noted that the corresponding circuit for the relay ZX cannot be closed at this time, because of the open circuit position of the contact element DF5. The actuation of the relay FX will energize the closin coil FC to close the breaker FCB as described hereinbeiore.

The actuation of the relay FX will also energize the toggle operating winding FIB of the recloser Fl from positive potential through FX--l Fill and CF-2 to negative potential. The energization of the toggle operating winding FIB will cause the contact element FI--I to move to the right-hand contact position to energize the tim-' ing motor FIT from Fa through FIT, FCB-4 and CF3 to Fb. If the circuit breaker FCB remains 0 closed after the above-described immediate reclosure, the timing motor FIT will continue to operate until its contact element FITI reaches contact position to energize the toggle operating winding FIR from positive potential through FCB-5, F|Tl, FIR and CF -2 to negative potential. The contact element FI-l will be moved from the right-hand to the left-hand contact position to thereby set up the immediate reclosing circuit for the relay FX.

In the event that the circuit breaker FCB trips after being reclosed within the timing interval of the timing motor FIT, the energizing circuit for the motor FIT will be broken at contact element FCB4, and the relay cannot be reenergized by the opening of the breaker FCB because the energizing circuit for the relay FX depends upon the contact element FITI in the left-hand position.

When the busFZR is deenergized, the reclosers F8, Z3 and 11-3, whose operation was described hereinbefore, cannot function to reclose their associated breakers because of the open circuit position of contact element DBX-I, DBX1 and DBX-Q. 1

In the event that the circuit breaker FCB that, with potential on the circuit FL, the relay' DF will be energized and the contact element DF-- will hold the energizing circuit for the relay ZX open. There is no recloser shown corresponding to the reclosers FI and Zl associated with the circuit breaker RCB, but such a recloser'may be employed if desired.

With the circuit breakers FCB, ZCB and R03 opened by a fault on the bus FZR as described hereinabove, if the power circuit FL should be deenergized, the relay DF will be released to open contact element DF-2 in the recloser circuit to thereby prevent reclosure of the circuit breaker FCB. The circuit breaker ZCB would make one attempt to reclose,- however, with the circuit FL deenergized and the circuit ZL energized. Under these circumstances,. the relay ZX will be energized from positive potential through ZY-I, ZX, ZCB-3, Zl-I in the leftehand contact position, DF-'-5, DBX-4, DZ-Z, .AZX-2 and 02-4 to negative potential. The circuit breaker ZCB will thus be reclosed immediately, and the recloser Zl will prevent a second reclosure of the breaker ZCB trips again within the time interval of the timing motor ZIT as described hereinbefore in connection with the control of the circuit breaker FCB by the recloser Fl.

Operation of automatic synchronizer this patent for a detailed description of its construction and operation. It will be noted that such a thermionic type automatic synchronizer requires a source of direct-current power. In the present invention, this direct-current power is supplied by a B eliminator BE which comprises any suitable thermionic-type rectifier, and which requires an interval of energization before it will] operate properly as a rectifier. v

In the event that power is restored to the bus FZR and the bus is t us energized by the power circuit FL and there is potential on the power circuits ZL and RL, the automatic synchronizer willfunction to close first the breaker ZCB and then the breaker .RCB after synchronism between the potentials on the respective power circuits ZL and RL and the bus FZR has been reached.

It will be noted that the closure of the breaker FCB will release the relay BFW by the opening of the contact element PCB-I0. The relays BZW and BRW will remain actuated since the gize the relay BZX from positive potential through BZZ-2, BZX and BZW-2 to negative potential.

The relay BZX will connect the B" eliminator BE with the automatic synchronizer AS from BE through AS, BZX'3, and BZW-4 to BE. The relayBZX will also connect the automatic synchronizer As .to be acted upon by the potentials of the potential transformers BP and Z? in a circuit extending from Ba through AS, Za, ZP, Zb, ZCB-l3 and BZX-5 to Bb. When synchronism is reached between the bus potential and the potential on the power circuit ZL,

the automatic synchronizer AS will actuate the relay S. l

The relay S will energize the relay ZX from positive potential through ZY-I,ZX, BZX--2, and S-l to negative potential. The relay 'ZX will function to close the circuit breaker ZCB in the manner described hereinabove in connection with the closure of the breaker FCB by the relay FX.

The closure of the breaker ZCB will deenergize the relay BZW at ZCB-l0. The release of the relay BZW will deenergizethe relay BZY at BZW3, and the release or the relay BZY will energize the relay BRY from Ba through which, in turn, will connect the automatic synchronizer AS to close the breaker RCB when 40 buS FZR.

breakers ZCB and B6B are still open. When H the relay DBX is actuated by the energization of the bus FZR, the relay BZY will be energized from Ba through BFY-Z, BZY, BZW-3, DZ-l,

synchronism is reached, as described in connection .with the closure of the breaker ZCB upon the circuit ZL reaching synchronism with the The circuit breaker FCB will be closed by the automatic synchronizer .AS whenever breaker is open, and there is potential on the bus FZR and the power circuit FL and its closure by the synchronizer AS will take precedence over the closure of either of the other breakers by the synchronizer. Thus, in the event that, for any reason, the breaker RCB shouldbe closed and supplying power to the bus FZRand the breakers PCB and ZCB should be open with the circuits .FL and ZL energized, the relay BFY will be energized from Ba through BFY, BFW-3, DF-l, CF'! and DEX-'6 to Bb. The relay BFY will prevent the energization of the relay BZY .by

opening the contact element BFY-2. The relays BFZ and BFX will then be energized to synchronize and close the breaker FCB in the manner explained hereinabove in connection with the closure of the breaker ZCB by the operation of relays BZZ and FZX.

If any of the breakers FCB, ZCB and RCB should be tripped by the fault relay EX or their.

' respective fault relays FF, F2 and FR. upon being reclosed by the automatic .synchronizerAS be.- fore the release of their respective delayed-release relays BFZ, BZZ and BRZ, the respective contact elements BFZ-l, BZZ-l and BRZ-I will be in open circuit position and prevent the relays BFV, BZV and BRV' from being energized mately the interval required for rendering the a B eliminator BE operative after it is energized by the relay BZY, the relay BZZ will enerby the fault relays FF, F2 and FR respectively to thereby prevent reclosure of the respective breakers FCB, ZQB and ROB through the automatic synchronizer. e

In the event that any'of the breakers should trip upon being closed by the automatic synthis chronlzer and there is power on the associated circuit, the breaker may be connected for closure tore the relay FBZ has released, as explained hereinabove. An operator may manually actuate a control switch FCSC to thereby energize the relay BFW from positive potential through FCB-l0, BFW, FCSC-4 and CF2 to negative potential. The relay BFW will then close its own holding circuit and energize the relays BFY and BFX to thereby connect the automatic synchronizer in control relation with the breaker FCB, as described hereinabove. breakers ZCB and R03 may be manually connected to be controlled by the automatic synchronizer whenever there is potential on both sides of the breakers, by means of the local control switches ZCSC and RCSC in the same manner that the local control switch FCSC connects the breaker FCB to be closed by the synchronizer. The circuit breakers FCB, XCB and R028 may be placed under the control of local control switches FCSC, FCST, ZCSC, ZCST, RCSC and RCST by moving the transfer switch operators CFL, CZL and CRL to the left-hand position to thereby permit their biasing springs 30, 32 and 34 to open their front contact elements and close their back contact elements. With the transfer switch CF in the manual or local control position, the reclosers Fl and F3 are rendered inoperative by the opening of the contact elements CF-3 and CFI respectively.

When the transfer switch CF is in local control position, the breaker FCB may be tripped by actu- The control switch POST or the supervisor control relay FST their control elements FCST-I and FST-3, respectively, will be iii-open circuit position to prevent energization of the relay BFV and thus prevent reclosure oi the breaker through the automatic synchronizer A8. The breaker FCB may be closed by the supervisory control relay FSC after it has been tripped by the supervisory control relay PST 11' either the circuit FL or the bus FZR is deenergized. If the bus FZR is deenergized, the relay DBX will be released and the contact element DBX-l will be closed; it the circuit FL is deenergized, the relay DF will be re leased and the contact element DF-I will be closed. The actuation of the relay FSC will energize the relay FX from positive potential through FY-l, FX, DF-I or DBX-I, FSC-I and CP -2 to negative potentiaL- The relay AFX will also be energized by the relay FSC from positive potential through the resistor 38, AFX, FSC-4, CF-i and (IF-2 to negative potential. With the relay AFX energized and the transfer switch in the automatic position, the system will be reset for automatic reclosing and synchronizing operations, as explained hereinabove.

In the event that there is potential on both the bus FZR and the circuit FL when the supervisory relay FSC is actuated, the contact element FSC-4 will close the energizing circuit for the relay BFW which will initiate the hereinbeiore described operations to connect the automatic synchronizer to close the breaker FCB.

ating'the manually operable local control switch FCST. A relay AFX is normally energized from positive potential through a current limiting resistor 38, AFX and AFX-J to negative potential. The control switch FCST will close a shunting circuit for the relay AFX from positive potential through the resistor 38, FCST-J and CF-i to negative potential, thus releasing the relay AFX.

The trip circuit for the breaker FCB will be closed from positive potential through FCB-8, FCB-l, F1, AFX3, FCST-l and CF-l to negative potential. The breaker FCB may be closed by actuating the local control switch FCSC which will energize the relay AFX from positive potential through the resistor 36, AFX and FCSC-4 to negative potential. The relay AFX will close its own holding circuit shown in the drawings.

The control switch FCSC will also energize the relay FX from positive potential through FY-l, Fx FCSC-I and CF4 to negative potential.

-When the transfer switch CF'is in the automatic position, the breaker FCB cannot be tripped by the local control switch FCST since the con/- tact element Cli'wi will be open and FCST-t v The contact element AFX2 will be in open position to prevent automatic reclosure of the breaker FCB when it is tripped by the supervisory control relay FST.

When the breaker FCB is tripped by the local When the transfer switch CF is in the local control position, the control switch FCSC may be actuated to close the breaker FCB by energizing the relay FX from positive potential through .FY-l, Fx, FCSC-l and CF to negative potential. It is to be understood, however, that the operator would not close any of the breakers FCB, ZCB, or RC3 by means of the local control switches FCSC, ZCSC or RCSC without checking whether there is potential on both sides of the breakers and testing for synchronism by means of a synchroscope in the event that there is potential on both sides of the breakers.

It is to be understood that the control system described herein is not limited in its application to the control of only three circuit breakers that as many circuit breakers as desired may be controlled by the system described herein, that any or all or the breakers may be controlled by single shot and for triple shot re'closures such as the reclosuresFi andm.

Thus it will be seen that I have provided an automatic reclosing circuit breaker control system which shall function in response to the operation of a plurality of breakers and the potentials on the several circuits controlled by the breakers to selectively reclose the breakers, an'd synchronize the potentials on the circuits before V closing the breakers in a predetermined order of preference, which shall function to selectively reclose the breakers a desired number of times depending upon the potential conditions on the two sides or the breakers and which shall function to provide selective supervisory control and local manual control or the breakers subject to the potential conditions on the breakers.

It is to be understood that the invention is not limited to the precise construction shown and described herein, but it is capable oi modification by one skilled in the art, the embodiment shown herein being merely illustrative of the principles 0! the invention.

I claim as my invention:

1; Inan automatic reclosing circuit breaker control system for a pair of circuit breakers each disposed to connect a separate power circuit to a common bus, means responsive to the openingv 2. In an automatic reclosing circuit breaker control system, a pair of circuit breakers each disposed toconnect a separate circuit to a common bus, a single synchronism responsive device comprising means for closing a breaker after the breaker is connected thereto and synchronism between the potentials on the two sides of the breaker is reached, means responsive to opening" 6. In a control system for a circuit breaker, means for automatically reclosing the breaker immediately after it is opened in the event that potential exists on only one side of the breaker after it is opened, means for reclosing the breaker a plurality of times after said first reclosure in oi. the breakers and the potentials on thetwo sides of the breakers for automatically connecting a predetermined one'of the breakers to be controlled by the synchronism responsive device in the event that there is potential on both sides of the breakers, and further means responsive to the closure of said predetermined one of the breakers by the synchronism responsive device for conmeeting the other or the breakers to be controlled by the synchronism responsive device.

3. In an automatic reclosing circuit breaker control system, a plurality of 'circuit breakers each disposed to connect a separate circuit to a common bus, a single synchronism responsive device comprising means for closing a breaker after the breaker is connected thereto and synchronism between the potentials on the two sides of the breaker is reached, means responsive to the opening 01' the breakers and the potentials on the two sides oi the breakers for automatically connecting a predetermined one of the breakers to be closed by the synchronism responsive device in the event that there is potential on both sides of the breakers, and further means responsive I after it is opened, means for reclosing the breaker to the closure of each preceding breaker by the synchronism responsive device" for closing each of the remaining breakers in succession in a predetermined order.

4. In a control system for a circuit breaker, means for automatically reclosing the breaker immediately after it is opened in the event that potential exists on only one side of the breaker after it is opened, a synchronism responsive device for closing the breaker when connected to a plurality of times after said first reclosure in .the event that it is opened after each reclosure and potential exists on a first side of the breaker only, and means for preventing further reclosures o! the breaker in the event that -it is opened within a predetermined time after the first reclosureand potential exists on thesecond side 0! the breaker only. v

the event that it is opened after each reclosure and potential exists on a first side of the breaker only, means for preventing further reclosuresof the breaker in the event that it is opened within a predetermined time after the first reclosure and potential exists on the second side of the breaker only, a synchronism responsive device for-closing the breaker when connected to respond to the potentials on the two sides of the breaker and synchronism between these potentials is reached, and means responsive to the presence of potential on the two sides of the breaker after said. automatic opening of th breaker for connecting the synchronism responsive device to respondto said potentials.

- 7. In a control system for a circuit breaker connecting two power circuits, means for automatically reclosing the breaker immediately afterit is opened inthe event that potential exists on the power circuit on only one side of the breaker a plurality of times after said first reclosure in the event that it is opened after each reclosure and potential exists on the power circuit on a first side of the breaker only, means for preventing further reclosures of the breaker in the event that it is opened within a predetermined time after the first reclosure and potential exists on the power circuit on a second side of the breaker only, a synchronism responsive device for closing the breaker when connected to respond to the potentials on the power circuits on both sides of the breaker and synchronism between said potentials is reached, means responsive to the presence of potential on the power circuits on both sides of the breaker after said automatic opening of the breaker for connecting the synchronism responsive device to respond to said potentials, and means'responsive to the conditions of the power circuits on both sides of the breaker for preventing reclosure of the breaker in the event that no potential exists on said circuits after said automatic opening of the breaker.

8. In an automatic reclosing circuit breaker control system, a circuit breaker, a synchronism responsive device, means whereby said synchronism responsive device,.when connected to respond to the potentials on the two sides of'the breaker, will close the breaker when synchronism between the potentials on the two sides or the breaker is reached, means responsive to the automatic opening of the breaker and the potentials on the two sides of the breaker for connecting the synchronizer to respond to the potentials on the two sides of the breaker, means responsive to the closure of. the breaker by the synchronizer for preventing another reclosure by the synchronizer in the event that the breaker is opened again within a predetermined time after the closure of the breaker, and manual means .ior thereafter conaiter it'is opened, means for reclosing the breaker Y necting the synchronizer 'to reclose the breaker when synchronism between the potentials on the two sides of the breaker is reached.

9. In an automatic. reclosing circuit breaker control system for a circuit breaker disposed to connect two power circuits, means responsive to tential on only one of the power circuits, synchronizing means responsive to the potentials on the power circuits and the automatic opening of the breaker for closing the breaker when synchronism between the potentials on the two power circuits is reached in the event that there is potential on both of the circuits, first manually operable means for rendering said automatic reclosing means and said synchronizing means in- I operative to reclose the breaker, and second manually operable means for opening and closing said breaker at will when said first manually'operable means is actuated.

10. In an automatic reclosing circuit breaker control system for a circuit breaker disposed to connect two power circuits, means responsive to the automatic opening of the breaker and the condition of said power circuits for immediately automatically reclosing the breaker in the event that there is potential on only one of the power circuits and for also reclosing the breaker in the event that there is potential on both of the circuits and the potentials on the circuits are in sy chronism, means for preventing a second reclosure of the breaker in the event that the breaker trips within apredetermined time after the first reclosure and there is potential on one of the circuits and not on the other, means for automatically reclosing the breaker a predetermined plurality of times in the event that there is potential on the said other circuit and not on the one circuit and the breaker trips after each reclosure, and means for preventing a second reclosure of the breaker in response to synchronism in the event that the breaker trips within a predetermined time after being reclosed in response to synchronism.

11. In an automatic reclosing circuit breaker control system, a circuit breaker disposed to connect two circuits, means responsive to the automatic opening of the breaker for automatically reclosing the breaker, remotely controlled means for opening and closing the breaker, means responsive to the operation of the remotely controlled breaker opening means for preventing operation of the automatic reclosing means, manually operable breaker opening means, manually operable breaker closing means, manually operable control means, means responsive to the actuation of the manually operable control means for preventing opening or closing of the breaker by the remotely controlled means, and means responsive to the acof the automatic reclosing means responsive to the operation of the remotely controlled breaker closing means for closing the breaker when synchronism between the potential on the circuits is reached after the breaker has been prevented from reclosing automatically by being opened within a predetermined time after being reclosed in response to synchronism, manually operable breaker closing means, means responsive to the actuation of the manually operable breaker closing means for closing the breaker when synchronism between the potentials on the circuits is reached after the breaker has been prevented from reclosing automatically by being opened within a predetermined time after being reclosed in response to synchronism, manually operable breaker opening means, manually operable control means, means responsive to the actuation of the manually operable control means for preventing opening or closing of the breaker by the remotely controlled means, and means responsive to the actuation of the manuall operable con-.

trol means for preventing operation of the automatic reclosing means.

13. In a control system for a circuit breaker connected between two power circuits, means responsive to the opening of the breaker and the tial on the power circuit on the other and the tuation of the manually operable control means for preventing operation of the automatic reclosins means.

12. In an automatic reclosing circuit breaker control system, a circuit breaker disposed to connect two circuits, means responsive to the automatic opening of the breaker and the potentials on the circuits for automatically reclosing the breaker in the event that there is potential on one of the circuits only, means responsive to the automatic opening of the breaker and the potentials on the circuits for automatically closing the breaker in the event that there is potential on both of the circuits when synchronism between the potentials on the circuit is reached, means for preventing a second reclosure of the breaker in response to synchronism in the event that the breaker is opened automatically within a predetermined time after being reclosed in response to synchronism, remotely controlled means for breaker trips after each reclosure, means responsive to the opening of the breaker and the condition of the power circuits on both sides of the breaker for reclosing the breaker a single time only in the event that there is potential on the power circuit on said other side of the breaker and there is no potential on the power circuit on the said one side of the breaker, and the breaker trips after being reclosed, and means responsive to the opening of the breaker and the condition of the power circuits on both sides of the breaker for closing the breaker in the event that there is potential on the power circuits on both sides of the breaker and the potentials on said power circuits are in synchronism.

14. In an automatic reclosing system for a circuit breaker connected between two power circuits, means responsive to the opening of the breaker and the condition of the power circuits on both sides of the breaker for automatically reclosing the breaker in the event that there is potential on only one side of the breaker, means responsive to the opening of the breaker and the condition of the power circuits on both sides of the breaker for closing the breaker inthe event that there is potential on the power circuits on both sides of the breaker and the potentials on said power circuits on both sides of the breaker are in synchronism, and means responsive to the reclosure of the breaker in response to synchroriism for preventing a subsequent reclosure in the power circuit on one side of the breaker and there is no potential on the power circuit on the other side of the breaker and the breaker trips 7 after each reclosure.

16. In an automatic reclosing circuit breaker system for a plurality of circuit breakers each disposed to connect a separate power circuit to a common bus, relay means responsive to the opening of the breakers and the deenerg'ization oi. the-common bus for efiecting a reclosure of a predetermined one of the breakers in the event that the power circuits of all the breakers remain energized, and additional relay means operable 17. In anhutomatic reclosing circuit breaker system for a plurality of circuit breakers each disposed to connect a separate power circuit to a common bus, relay means responsive to a fault on the common bus for effecting the opening of all the breakers, and additional relay means jointly responsive to the opening of a predetermined one of said breakers and the deenergized condition of the common bus for eflecting a reclosure of said predetermined one of the breakers in the event that the power circuits of all the breakers remain energized when said breakers are opened in response to common bus.

WILLARD A. DERR.

the fault on the 

